I figured 9.3 is becoming more popular in North America and ammo can probably more easily be found in Africa than 35 Whelen. I make 35 Whelen brass out of 30-06. Don't know if I could do that converting 30-06 to 9.3 or not. 9.3 x 62 may need a little longer brass than the 30-06 cartridge can resize to.
